A peripheral (truncation of â€œperipheral deviceâ€?) is any computer device that is not part of the essential computer (the processor, memory, and data paths) but is situated relatively close by. Some peripherals are mounted in the same case with the main part of the computer, as are the hard disk drive, CD-ROM drive, and NIC. Other peripher...Found on http://www.encyclo.co.uk/local/20505

Any of the devices which connect to the CPU and exchange information under the CPU's control. Peripherals include all of the computer's input and output devices.
Found on http://www.encyclo.co.uk/local/20581

Peripheral: Situated away from the center, as opposed to centrally located. For example, peripheral vision means the type of vision that allows one to see objects that are not in the center of one's visual field. The word 'peripheral' comes from the Greek 'peripheria' ('peri-', around or about + 'pherein', to bear, carry). An IV (intravenous) cathe...Found on http://www.medterms.com/script/main/art.asp?articlekey=8262

Pe·riph'er·al adjective 1. Of or pertaining to a periphery; constituting a periphery; peripheric. 2. (Anat.) External; away from the center; as, the peripheral portion of the nervous system. Found on http://www.encyclo.co.uk/webster/P/56

peripheral 1. Related to, located in, or constituting an outer boundary or periphery. 2. Perceived or perceiving near the outer edges of the retina; such as, peripheral vision. 3. Of the surface or outer part of a body or organ; external. 4. Situated away from the center, as opposed to centrally located; for example, peripheral vision means the t...Found on http://www.wordinfo.info/words/index/info/view_unit/1610/13